The mean of 100 observations is 50. If one of the observation which was 50 is replaced by 150, the resulting mean will be

1. 50.5

2. 51

3. 51.5

4. 52

For drawing a frequency polygon of a continuous frequency distribution, we plot the points whose ordinates are the frequencies of the respective classes and abscissae are respectively :

1. upper limits of the classes

2. lower limits of the classes

3. class marks of the classes

4. upper limits of preceding classes

The median of the data

78, 56, 22, 34, 45, 54, 39, 68, 54, 84 is

1. 45

2. 49.5

3. 54

4. 56

In a data, 10 numbers are arranged in ascending order. If the 8th entry is increased by 6, then the median increases by

1. 0

2. 2

3. 3

4. 6